EP3242859B1 - Sewage treatment device, such as a vertical-percolation planted filter, comprising a system for active aeration of a saturated lower layer - Google Patents

Sewage treatment device, such as a vertical-percolation planted filter, comprising a system for active aeration of a saturated lower layer Download PDF

Info

Publication number
EP3242859B1
EP3242859B1 EP16702755.6A EP16702755A EP3242859B1 EP 3242859 B1 EP3242859 B1 EP 3242859B1 EP 16702755 A EP16702755 A EP 16702755A EP 3242859 B1 EP3242859 B1 EP 3242859B1
Authority
EP
European Patent Office
Prior art keywords
wastewater
lower layer
aeration
basin
treatment
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
EP16702755.6A
Other languages
German (de)
French (fr)
Other versions
EP3242859A1 (en
Inventor
Joëlle PAING
Florent CHAZARENC
Vincent GAGNON
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Opure
Original Assignee
Opure
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Opure filed Critical Opure
Publication of EP3242859A1 publication Critical patent/EP3242859A1/en
Application granted granted Critical
Publication of EP3242859B1 publication Critical patent/EP3242859B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Classifications

    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F3/00—Biological treatment of water, waste water, or sewage
    • C02F3/32—Biological treatment of water, waste water, or sewage characterised by the animals or plants used, e.g. algae
    • C02F3/327—Biological treatment of water, waste water, or sewage characterised by the animals or plants used, e.g. algae characterised by animals and plants
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F3/00—Biological treatment of water, waste water, or sewage
    • C02F3/02—Aerobic processes
    • C02F3/04—Aerobic processes using trickle filters
    • C02F3/043—Devices for distributing water over trickle filters
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F3/00—Biological treatment of water, waste water, or sewage
    • C02F3/30—Aerobic and anaerobic processes
    • C02F3/301—Aerobic and anaerobic treatment in the same reactor
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2101/00—Nature of the contaminant
    • C02F2101/10—Inorganic compounds
    • C02F2101/16—Nitrogen compounds, e.g. ammonia
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
    • C02F2103/32—Nature of the water, waste water, sewage or sludge to be treated from the food or foodstuff industry, e.g. brewery waste waters
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2209/00—Controlling or monitoring parameters in water treatment
    • C02F2209/04—Oxidation reduction potential [ORP]
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2209/00—Controlling or monitoring parameters in water treatment
    • C02F2209/22—O2
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2305/00—Use of specific compounds during water treatment
    • C02F2305/06—Nutrients for stimulating the growth of microorganisms
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F3/00—Biological treatment of water, waste water, or sewage
    • C02F3/02—Aerobic processes
    • C02F3/04—Aerobic processes using trickle filters
    • C02F3/046—Soil filtration
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F3/00—Biological treatment of water, waste water, or sewage
    • C02F3/30—Aerobic and anaerobic processes
    • C02F3/302—Nitrification and denitrification treatment
    • C02F3/305—Nitrification and denitrification treatment characterised by the denitrification
    • C02F3/306—Denitrification of water in soil
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W10/00—Technologies for wastewater treatment
    • Y02W10/10—Biological treatment of water, waste water, or sewage

Definitions

  • the field of the invention is that of the design and manufacture of wastewater treatment systems. More specifically, the invention relates to the design of a vertical percolation filter type wastewater treatment device.
  • Planted filters can be vertical or horizontal percolation.
  • the arrival of effluents in the massif is carried out on one of the sides, they then walk horizontally in the premise to be recovered at the other end.
  • the water level in the massif is maintained at about 5 to 10 cm from the surface and most of the filter is then in saturated and anoxic medium.
  • the feed is generally continuous and the oxygen supply is greatly reduced.
  • the conditions are then favorable for denitrification reactions carried out by denitrifying bacteria (leading to the reduction of nitrates to gaseous compounds). It should be noted that these bacteria are heterotrophic and therefore need organic matter to grow. As the flow rates are slower and the contact time with bacteria higher, these filters promote the elimination of organic matter that is difficult to biodegrade.
  • the main pollutants eliminated are suspended solids, organic matter and nitrogen compounds.
  • the purifying mechanisms are governed by physical (filtration, adsorption) and biological (aerobic microbial degradation, nitrification, plant assimilation) mechanisms. Note that in these filters, the treatment of global nitrogen is low because it is limited to nitrification by nitrifying bacteria under aerobic conditions (leading to the oxidation of ammoniacal nitrogen to nitrites and nitrates).
  • One of the particularities of this sector is that it does not include pre-treatment (except for rough screening) and sends the raw effluents directly to the surface of the first stage.
  • the particulate matter contained in the wastewater is retained by surface filtration mechanisms, where it is progressively dehydrated and mineralized.
  • the accumulation of sludge is thus low (around 1.5 cm / year), which results in very frequent cleaning intervals (once every 10 to 15 years).
  • sludge quality is compatible with agricultural upgrading without additional treatment.
  • mixed dies constituted by the combination of vertical and horizontal type filters, in series, in particular to improve the performances on the global nitrogen by favoring the nitrification and denitrification reactions.
  • NNL global nitrogen
  • the prior art also proposes a solution described in the patent document published under the number FR 2 973 796 A1 .
  • the wastewater treatment device described in this document includes a purification tank in which the wastewater flows vertically. However, this device does not effectively treat effluents heavily loaded organic dissolved pollution and nitrogen.
  • the prior art still proposes a solution described in the patent document published under the number US 2003/024874 A1 .
  • the wastewater treatment device described in this document comprises several sewage tanks connected in series. As a result, the land takeover of this device is important.
  • the invention particularly aims to overcome these disadvantages of the prior art.
  • the invention aims to provide a wastewater treatment system efficient and having a reduced land footprint.
  • Another object of the invention is to propose such a system which makes it possible to treat highly charged effluents with a single basin, a higher nitrification yield than is allowed by the single-basin solutions proposed by the prior art and a strong yield on the global nitrogen.
  • the invention also aims to provide such a system that has contained operating costs.
  • passive aeration means designates, for example, the supply of 02 excreted by the roots of the plants or the diffusion from the surface. These systems make it possible to maintain the unsaturated upper layer in water under aerobic conditions.
  • the unsaturated upper layer thus produced allows the filter to promote the treatment of particulate solids retained on the surface and not to require special pretreatment to remove at least a large portion of the latter.
  • the lower layer provides an advantageous treatment of dissolved pollution.
  • the active aeration system makes it possible to increase the kinetics of degradation, in particular for effluents heavily loaded with dissolved organic and nitrogen pollution.
  • the treatment device according to the invention is suitable for the treatment of domestic wastewater discharged by a community but also for the treatment of wastewater discharged by an individual dwelling. It can also be applied for the treatment of industrial or agricultural effluents.
  • this device is advantageously adapted to the treatment of effluents heavily loaded with organic matter and containing particulate matter as generated by the food industry (meat industry, fruit and vegetable industry, bakery / industrial pastry, cheese / industry dairy, wine cellar ).
  • a treatment device thus makes it possible to treat highly charged effluents with a single basin, hence a reduced land footprint.
  • the device allows the treatment of domestic effluents and industrial or agricultural effluents containing particulate matter, without pretreatment (except a rough screening), while ensuring high yields on the parameters MES, DCO, BOD 5 , NTK , as well as on global nitrogen.
  • the invention retains certain advantages of planted filters: good landscape integration, easy and inexpensive maintenance, low sludge production, lower energy consumption than "intensive" activated sludge type processes, no consumption of chemicals, high purification performance and good adaptation to load variations.
  • the minimum height H2 of the upper layer is particularly important, in particular to promote the dehydration of particulate matter by a drainage mechanism. Indeed, the dehydration of particulates favored by this feature allows the device according to the invention to overcome pretreatments found in the solutions proposed by the prior art.
  • the drains network is particularly suitable for particulate matter-laden effluents, with the goal of promoting the treatment of particulate matter retained at the surface by drainage dewatering and aerobic mineralization mechanisms.
  • active aeration system refers to a ventilation system in which the air is actively supplied, for example by means which may take the form of pumps, fans or superchargers.
  • the purification basin comprises systems for supplying wastewater by sheeting.
  • Such a wastewater supply system improves the oxygenation of the upper layer. Indeed, the arrival of the effluents being done in a discontinuous manner (by "tarpaulin”) we find a convection effect, related to the piston effect of the displacement of the water strips made to each tarpaulin. In addition, this system provides a good distribution of wastewater over the entire surface of the purification tank.
  • the active aeration system of the saturated bottom layer is an intermittent active aeration system.
  • the ventilation system thus designed makes it possible on the one hand to reduce energy consumption and, on the other hand, to improve the treatment of global nitrogen by promoting nitrification and denitrification reactions.
  • the intermittent active aeration system comprises a timer.
  • the system can be programmed to cycle one hour of ventilation followed by one hour of aeration stop.
  • the device comprises sensors for determining dissolved oxygen parameters and / or oxidation-reduction potential in the lower layer
  • the intermittent active aeration system comprises an automatic switch coupled to sensors.
  • the wastewater treatment device comprises a plurality of purification tanks connected in parallel.
  • the intermittent active aeration systems of the saturated lower layer of each purification tank form an aeration network, and the aeration network comprises alternating air supply means of intermittent active aeration systems.
  • alternating air supply means may take the form of pumps, fans or boosters that alternately feed the aeration systems through valves.
  • the wastewater supply systems of each purification basin form a sewage supply network, the sewage supply network comprising means for alternately feeding the wastewater systems. of wastewater.
  • the alternating feeding means of the delivery systems allow in particular to have rest periods favorable to the dehydration and mineralization of particulate matter retained on the surface.
  • a device comprising a plurality of purification tanks and can treat a continuous stream of wastewater while allowing the application of these periods of rest.
  • the wastewater treatment device 1 is of the vertical percolation filter type (which by definition involves a circulation of the wastewater in the device according to a vertical flow).
  • the device 1 comprises a purification tank 10.
  • a sealing complex 9 is located on the sides and the bottom of the basin. It takes the form, for example, of a geomembrane of high density polyethylene (HDPE), placed on an anti-punching geotextile.
  • HDPE high density polyethylene
  • Edges 90 are also arranged around the basin, these borders may be polypropylene, wood or concrete. In particular, they make it possible to protect the filter from run-off water and to protect the sealing complex from external damage (UV, rodents, malevolence, etc.).
  • the purification tank 10 comprises at least two superposed layers of filtering materials: a lower layer 100 and an upper layer 101 located above the lower layer.
  • plants are planted to promote the dehydration of surface-retained particulate materials, help maintain filter permeability, and promote aerobic microbial activity near roots and rhizomes.
  • These plants are for example plants of the type Phragmite, Glyceria, Scirpus, Phalaris.
  • This upper layer 101 is unsaturated with water. It comprises means of passive aeration. These passive aeration means comprise a network of ventilation drains 4 located at the bottom of the upper layer.
  • the lower layer 100 is saturated in water and located in the bottom of the basin. This lower layer comprises means for draining the treated wastewater.
  • the device also comprises water retention means 2 adapted to maintain, in the basin in operation, a water of a predetermined height that corresponds to the entire height of the lower layer 100.
  • the device 1 comprises an active aeration system 3 of the saturated lower layer.
  • This active aeration system is located in the bottom of the lower layer and extends over substantially the entire surface covered by the lower layer of the purification tank.
  • the purification basin comprises wastewater delivery systems 5 by tarpaulins.
  • the device may comprise one or more purification tanks connected in parallel.
  • the wastewater supply systems of each basin form a sewage supply network comprising means for supplying wastewater. alternation of said delivery systems.
  • these alternating power supply means consist of manual or automatic valves, arranged between the feeding system (automatic flushing or lifting station) and the basins. This alternation makes it possible, in particular, to have rest periods favorable to the dehydration and the mineralization of the particulate matter retained on the surface.
  • the artificial aeration network (formed by the intermittent aeration systems of the saturated lower layer of each basin) can also be supplied alternately: the aeration network comprising means alternating air supply of the ventilation systems.
  • the alternating air supply means take the form of manual or automatic valves, arranged between the air distribution system (pump, fan, booster) and the basins.
  • a wastewater treatment device can operate and be adapted as described below.
  • the device can be fed with raw wastewater previously screened (mesh size of 20 to 30 mm) to eliminate the coarsest waste.
  • the wastewater is then sent to the surface of the basin in operation, by means of a feed ramp of the wastewater supply systems 5 which can be aerial or underground (as represented on the figure 1 ).
  • the supply network formed by the delivery systems is composed of a main feeder 50 and several diffusers 51, below which are installed anti-scouring plates 6.
  • a control eye 500 can be mounted at the end of the main nanny, to allow the emptying of the pipe, and possibly cleaning.
  • tarpaulin which promotes a good distribution over the entire surface and better oxygenation of the upper layer 101 unsaturated by convection.
  • the feeding by tarpaulin can be obtained by an automatic hunt operating without energy if the altitude allows it.
  • the power supply includes a lifting station containing at least one pump.
  • the wastewater percolates vertically in the unsaturated upper layer of the basin consisting for example of at least two sub-layers of gravel of different grain size.
  • a first sub-layer 1010 with a particle size of 2 to 6 mm at the surface, at a height of between 15 and 40 cm
  • a second underlayer 1011 located below the first underlayer, of coarser grain size of 4 to 20 mm over a height of 15 to 30 cm.
  • the upper layer thus has a height H 2 ⁇ 30 cm.
  • a layer of compost 102 5 to 15 cm high can also be added to the surface, to improve filtration performance and promote the growth of reeds at startup.
  • the network of ventilation drains 4 connected to at least one passive venting chimney 40 can be positioned at the bottom of this upper layer in order to contribute to maintaining it in aerobic condition, including during the phases of stopping the aeration. artificial by the active aeration system of the saturated lower layer.
  • Aeration drains 4 are particularly recommended in the case of particulate matter effluent to support the treatment of particulate matter retained at the surface by drainage dewatering and aerobic mineralization mechanisms.
  • the partially treated wastewater then reaches the lower saturated layer 100 in water with artificial aeration through the active aeration system.
  • the water level is maintained by means of the water retention means 2 which take the form of a look of charge 6 output.
  • This lower layer consists of at least one gravel sub-layer with a particle size of 10 to 40 mm over a height H1 of 40 to 150 cm.
  • the active aeration system 3 is positioned in the bottom of the basin and has an air distribution network composed of several drilled pipes allowing a homogeneous distribution of air over the entire surface of the lower layer.
  • the pipes may for example be pipes with self-regulating drippers which ensure uniform distribution, even over long lengths, and have a high resistance to clogging.
  • the oxygen present in the air sent into the bottom of the basin is diffused into the liquid phase of the saturated lower layer and is thus available for aerobic microbial degradations.
  • the air supply means may for example comprise a pump, a fan or a booster.
  • the air flow rate is between 0.1 and 1.5 Nm 3 / m 2 .h depending on the pollutant load to be treated.
  • the aeration system may be an intermittent system.
  • the treated water is then recovered by the drainage means via at least one transverse collection drain 7 (as shown on the figure 1 )
  • This connection is provided with an elbow with a water outlet whose level can be adjustable (between the bottom of the basin and the high level) of the saturated lower layer, corresponding to the low level of the intermediate passive aeration drain if existing).
  • a drain plug 71 at the base of the elbow makes it possible to empty the saturated lower layer if necessary, for example in the event of a lack of artificial aeration (electrical failure, compressor failure, etc.), in order to prevent risks of anoxia. prolonged in case of heavily loaded effluents and the risk of clogging.
  • the drainage means may also be connected to the passive ventilation chimneys 40.
  • the treated water is then discharged to the natural environment (river, ditch, lake, sea ...), underground infiltration, to a storage area for reuse, or to a finishing treatment.
  • the capacity of such a processing device according to the invention can be increased by providing an upper surface filter, or by adding one or more filters or additional filter sets, fed in parallel and / or alternately.
  • the effluent treatment device may comprise additional elements, upstream or downstream.
  • the device may comprise, for example, a degreasing device, a storage tank, an effluent neutralization device and / or a nutrient addition system to improve the biodegradability of the effluent.
  • the device may comprise, for example, a disinfection device, a sand filter, a dephosphatation device and / or a planted rejection zone.

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Biodiversity & Conservation Biology (AREA)
  • Microbiology (AREA)
  • Hydrology & Water Resources (AREA)
  • Environmental & Geological Engineering (AREA)
  • Water Supply & Treatment (AREA)
  • Organic Chemistry (AREA)
  • Botany (AREA)
  • Biotechnology (AREA)
  • Purification Treatments By Anaerobic Or Anaerobic And Aerobic Bacteria Or Animals (AREA)
  • Biological Treatment Of Waste Water (AREA)

Description

Le domaine de l'invention est celui de la conception et de la fabrication de systèmes de traitement des eaux usées. Plus précisément, l'invention concerne la conception d'un dispositif de traitement des eaux usées de type filtre planté à percolation verticale.The field of the invention is that of the design and manufacture of wastewater treatment systems. More specifically, the invention relates to the design of a vertical percolation filter type wastewater treatment device.

Le traitement des eaux usées par filtres plantés connaît un très fort développement depuis ces vingt dernières années. Ce type de système d'épuration est appliqué principalement pour le traitement des effluents domestiques des petites collectivités. Il présente de nombreux avantages :

  • une bonne intégration paysagère ;
  • un entretien facile et peu coûteux ;
  • une faible production de boues ;
  • pas de consommation d'énergie ni de produits chimiques ;
  • des bonnes performances épuratoires ;
  • une bonne adaptation aux variations de charge.
The treatment of sewage by planted filters has seen a very strong development over the last twenty years. This type of purification system is applied mainly for the treatment of domestic effluents in small communities. It has many advantages:
  • good landscape integration;
  • easy and inexpensive maintenance;
  • low sludge production;
  • no energy consumption or chemicals;
  • good purification performance;
  • good adaptation to load variations.

Les filtres plantés peuvent être à percolation verticale ou horizontale.Planted filters can be vertical or horizontal percolation.

Dans les filtres horizontaux, l'arrivée des effluents dans le massif s'effectue sur un des côtés, ils cheminent alors horizontalement dans le massif pour être récupérés à l'autre extrémité. Dans ce cas, le niveau d'eau dans le massif est maintenu à environ 5 à 10 cm de la surface et la majeure partie du filtre est alors en milieu saturé et anoxique. Dans ces filtres, l'alimentation est généralement continue et les apports d'oxygène sont fortement réduits. Les conditions sont alors favorables pour des réactions de dénitrification effectuées par des bactéries dénitrifiantes (conduisant à la réduction des nitrates en composés gazeux). Il est à noter que ces bactéries sont hétérotrophes et ont donc besoin de matière organique pour se développer. Les vitesses d'écoulement étant plus lentes et les temps de contact avec les bactéries plus élevés, ces filtres favorisent l'élimination de matière organique difficilement biodégradable.In the horizontal filters, the arrival of effluents in the massif is carried out on one of the sides, they then walk horizontally in the massif to be recovered at the other end. In this case, the water level in the massif is maintained at about 5 to 10 cm from the surface and most of the filter is then in saturated and anoxic medium. In these filters, the feed is generally continuous and the oxygen supply is greatly reduced. The conditions are then favorable for denitrification reactions carried out by denitrifying bacteria (leading to the reduction of nitrates to gaseous compounds). It should be noted that these bacteria are heterotrophic and therefore need organic matter to grow. As the flow rates are slower and the contact time with bacteria higher, these filters promote the elimination of organic matter that is difficult to biodegrade.

Dans des filtres verticaux, les eaux usées sont envoyées en surface, percolent verticalement à travers le massif filtrant et sont récupérées dans le fond par un réseau de drainage. Ces filtres sont majoritairement maintenus en condition aérobie, grâce à des mécanismes d'aération « passive » :

  • l'apport d'O2 excrété par les racines des plantes ;
  • la convection, liée à l'effet piston du déplacement des lames d'eau apportées à chaque bâchée ;
  • la diffusion, à la fois depuis la surface et par le fond grâce au réseau de drains relié à des cheminées d'aération (elle permet le renouvellement de la phase gazeuse des espaces inter-granulaires en milieu non saturé).
In vertical filters, the wastewater is sent to the surface, percolates vertically through the filter bed and is collected in the bottom by a drainage network. These filters are mainly maintained in aerobic condition, thanks to "passive" aeration mechanisms:
  • the supply of O 2 excreted by the roots of the plants;
  • convection, linked to the piston effect of the displacement of the water slides brought to each cover;
  • diffusion, both from the surface and from the bottom through the network of drains connected to ventilation chimneys (it allows the renewal of the gas phase of intergranular spaces in unsaturated medium).

Les principaux polluants éliminés sont les matières en suspension, les matières organiques ainsi que les composés azotés. Dans les filtres verticaux, les mécanismes épuratoires sont régis par des mécanismes physiques (filtration, adsorption) et biologiques (dégradation microbienne aérobie, nitrification, assimilation végétale). A noter que dans ces filtres, le traitement de l'azote global est faible car il se limite à la nitrification par les bactéries nitrifiantes en conditions aérobies (conduisant à l'oxydation de l'azote ammoniacal en nitrites puis en nitrates).The main pollutants eliminated are suspended solids, organic matter and nitrogen compounds. In the vertical filters, the purifying mechanisms are governed by physical (filtration, adsorption) and biological (aerobic microbial degradation, nitrification, plant assimilation) mechanisms. Note that in these filters, the treatment of global nitrogen is low because it is limited to nitrification by nitrifying bacteria under aerobic conditions (leading to the oxidation of ammoniacal nitrogen to nitrites and nitrates).

Dans ces dispositifs, les rôles principaux des végétaux plantés en surface sont les suivants :

  • maintenir la perméabilité du massif filtrant grâce aux voies hydrauliques créées par leurs tiges, racines et rhizomes (prévention des phénomènes de colmatage) ;
  • favoriser l'activité microbienne aérobie à proximité des racines et rhizomes qui servent de support de biofilm, notamment grâce à l'apport d'oxygène des végétaux ;
  • favoriser la déshydratation des matières solides retenues en surface le cas échéant, via l'évapotranspiration des roseaux.
In these devices, the main roles of plants planted on the surface are:
  • maintain the permeability of the filter bed thanks to the hydraulic channels created by their stems, roots and rhizomes (prevention of clogging phenomena);
  • promote aerobic microbial activity close to the roots and rhizomes that serve as a biofilm support, particularly through the supply of oxygen from the plants;
  • to promote the dehydration of solids retained on the surface if necessary, through the evapotranspiration of the reeds.

En France, la filière la plus largement appliquée est constituée de deux étages (ou bassins) de filtres verticaux en série, avec une surface totale de filtres de 2 à 2,5 m2/EH (1,2 à 1,5 m2/EH au premier étage et 0,8 à 1 m2/EH au deuxième étage ; avec EH = Equivalent-Habitant, correspond à la pollution journalière générée par une personne, soit le plus souvent 60 gDBO5/j, 120 gDCO/j, 90 gMES/j, 15 gNTK/j et 2.4 gPT/j). Une des particularités de cette filière est de ne pas comprendre de prétraitement (excepté un dégrillage grossier) et d'envoyer les effluents bruts directement sur la surface du premier étage. Ainsi, les matières particulaires contenues dans les eaux usées sont retenues par des mécanismes de filtration en surface, où elles sont progressivement déshydratées et minéralisées. L'accumulation de boues est ainsi faible (environ 1,5 cm/an), ce qui entraîne des fréquences de curage très espacées (une fois tous les 10 à 15 ans). De plus, la qualité des boues est compatible avec une revalorisation agricole sans traitement complémentaire.In France, the most widely applied system consists of two stages (or basins) of vertical filters in series, with a total filter area of 2 to 2.5 m 2 / EH (1.2 to 1.5 m 2 / EH on the first floor and 0.8 to 1 m 2 / EH on the second floor; with EH = Equivalent-Inhabitant, corresponds to the daily pollution generated by a person, most often 60 gDBO 5 / d, 120 gDCO / d, 90 gMES / d, 15 gNTK / d and 2.4 gPT / d). One of the particularities of this sector is that it does not include pre-treatment (except for rough screening) and sends the raw effluents directly to the surface of the first stage. Thus, the particulate matter contained in the wastewater is retained by surface filtration mechanisms, where it is progressively dehydrated and mineralized. The accumulation of sludge is thus low (around 1.5 cm / year), which results in very frequent cleaning intervals (once every 10 to 15 years). In addition, sludge quality is compatible with agricultural upgrading without additional treatment.

Il est maintenant connu que cette filière, constituée de deux filtres verticaux en série, permet d'obtenir des rendements épuratoires élevés pour les effluents domestiques (> 90%) sur les polluants : matières en suspension (MES), matières organiques (DBO5 et DCO) et azote réduit (NTK). En revanche, les performances sont limitées (< 30%) pour l'azote global (NGL) et le phosphore (PT). Cette filière présente aussi comme inconvénient d'avoir une emprise foncière relativement élevée (2 à 2,5 m2/EH).It is now known that this die, consisting of two vertical filters in series, makes it possible to obtain high purification efficiencies for domestic effluents (> 90%) on pollutants: suspended solids (MES), organic matter (BOD 5 and COD) and reduced nitrogen (NTK). On the other hand, performance is limited (<30%) for global nitrogen (NGL) and phosphorus (PT). This sector also has the disadvantage of having a relatively high land area (2 to 2.5 m 2 / EH).

L'art antérieur a proposé d'autres solutions.The prior art has proposed other solutions.

On retrouve ainsi des filières mixtes constituées par l'association de filtres de type vertical et horizontal, en série, notamment pour améliorer les performances sur l'azote global en favorisant les réactions de nitrification et dénitrification. Cependant, pour atteindre des rendements élevés (> 85%) sur l'azote global (NGL), on a généralement au moins trois étages (bassins) avec une recirculation, entrainant une emprise foncière élevée (> 4 m2/EH).There are thus mixed dies constituted by the combination of vertical and horizontal type filters, in series, in particular to improve the performances on the global nitrogen by favoring the nitrification and denitrification reactions. However, to achieve high yields (> 85%) on global nitrogen (NGL), there is usually at least three stages (basins) with recirculation, resulting in high land use (> 4 m 2 / EH).

On retrouve également des solutions qui font appel à des filtres compacts à percolation verticale avec superpositions de plusieurs couches de matériaux et l'utilisation de matériau filtrant poreux, capable de favoriser le développement de micro-organismes et permettant de réduire l'emprise foncière et de limiter les coûts d'exploitation. Néanmoins, ces filtres présentent des risques de colmatage de la couche supplémentaire de granulométrie inférieure, notamment dans le cas d'effluents fortement chargés. De plus, les nitrifications sont souvent incomplètes et ces filtres présentent de faibles rendements sur l'azote global (< 30%).There are also solutions that use compact vertical percolation filters with superimpositions of several layers of material and the use of porous filter material, capable of promoting the development of micro-organisms and reducing the land grab and limit operating costs. Nevertheless, these filters present risks of clogging of the additional layer of lower particle size, particularly in the case of heavily loaded effluents. In addition, nitrification is often incomplete and these filters have low yields on global nitrogen (<30%).

Plus récemment, une autre solution a été proposée par l'art antérieur, consistant à mettre en oeuvre des filtres compacts à percolation verticale avec une couche inférieure saturée en eau et une couche supérieure non saturée. Cette solution permet d'améliorer les performances sur l'azote global en favorisant les réactions de nitrification et dénitrification, ainsi que de réduire l'emprise foncière et limiter les coûts d'exploitation. Cette proposition présente cependant des difficultés à traiter des effluents fortement chargés (agro-alimentaires, agricoles...) avec un seul bassin, une nitrification souvent incomplète et un rendement sur l'azote global limité à 70%.More recently, another solution has been proposed by the prior art, consisting in implementing vertical percolation compact filters with a water-saturated lower layer and an unsaturated upper layer. This solution improves the performance of the global nitrogen by promoting nitrification and denitrification reactions, as well as reducing the land holdings and limiting operating costs. However, this proposal presents difficulties in treating highly loaded effluents (agro-food, agricultural, etc.) with a single basin, an often incomplete nitrification and an overall nitrogen yield of 70%.

Il est connu de l'art antérieur la solution décrite dans le document de brevet publié sous le numéro DE 42 25 699 C1 . Cette solution met en oeuvre un bassin de purification dans lequel les eaux usées s'écoulent de manière verticale au travers de quatre couches superposées de matériaux filtrants. Ce dispositif cherche à optimiser les réactions de dénitrification mais ne produit pas en pratique des résultats optimaux.It is known from the prior art the solution described in the patent document published under the number DE 42 25 699 C1 . This solution uses a purification tank in which the wastewater flows vertically through four superposed layers of filtering material. This device seeks to optimize the denitrification reactions but does not produce optimal results in practice.

L'art antérieur propose aussi une solution décrite dans le document de brevet publié sous le numéro FR 2 973 796 A1 . Le dispositif de traitement des eaux usées décrit dans ce document comprend un bassin de purification dans lequel les eaux usées s'écoulent de manière verticale. Ce dispositif ne permet néanmoins pas de traiter efficacement des effluents fortement chargés en pollution dissoute organique et azotée.The prior art also proposes a solution described in the patent document published under the number FR 2 973 796 A1 . The wastewater treatment device described in this document includes a purification tank in which the wastewater flows vertically. However, this device does not effectively treat effluents heavily loaded organic dissolved pollution and nitrogen.

L'art antérieur propose encore une solution décrite dans le document de brevet publié sous le numéro US 2003/024874 A1 . Le dispositif de traitement des eaux usées décrit dans ce document comprend plusieurs bassins d'épuration montés en série. En conséquence, l'emprise foncière de ce dispositif est importante.The prior art still proposes a solution described in the patent document published under the number US 2003/024874 A1 . The wastewater treatment device described in this document comprises several sewage tanks connected in series. As a result, the land takeover of this device is important.

L'invention a notamment pour objectif de pallier ces inconvénients de l'art antérieur.The invention particularly aims to overcome these disadvantages of the prior art.

Plus précisément, l'invention a pour objectif de proposer un système de traitement des eaux usées performant et présentant une emprise foncière réduite.More specifically, the invention aims to provide a wastewater treatment system efficient and having a reduced land footprint.

L'invention a également pour objectif de proposer un tel système qui permette de traiter des effluents fortement chargés avec un seul bassin, un rendement de nitrification plus élevé que ce qui est permis par les solutions à un seul bassin proposées par l'art antérieur et un fort rendement sur l'azote global.Another object of the invention is to propose such a system which makes it possible to treat highly charged effluents with a single basin, a higher nitrification yield than is allowed by the single-basin solutions proposed by the prior art and a strong yield on the global nitrogen.

L'invention a encore pour objectif de proposer un tel système qui présente des coûts d'exploitation contenus.The invention also aims to provide such a system that has contained operating costs.

Ces objectifs, ainsi que d'autres qui apparaîtront par la suite, sont atteints grâce à l'invention qui a pour objet un dispositif de traitement des eaux usées de type filtre planté dans lequel la circulation des eaux usées est à écoulement vertical, le dispositif comprenant un bassin de purification destiné à recevoir des eaux usées, le bassin comportant au moins deux couches superposées de matériaux filtrants :

  • une couche inférieure saturée en eaux située dans le fond du bassin et comprenant des moyens de drainage ;
  • une couche supérieure non saturée en eaux située au-dessus de la couche inférieure, la couche supérieure comportant des moyens d'aération passive, les moyens d'aération passive comportant un réseau de drains d'aération situé au fond de la couche supérieure ;
caractérisé en ce que le dispositif comprend un système d'aération actif de la couche inférieure saturée, le système d'aération actif étant situé dans le fond de la couche inférieure et étant réparti essentiellement sur toute la surface couverte par la couche inférieure du bassin de purification, le système d'aération actif étant destiné à aérer de manière homogène la totalité de la couche inférieure, le système d'aération actif de la couche inférieure saturée étant un système d'aération actif intermittent,
en ce que le dispositif comprend des moyens de rétention d'eau aptes à maintenir, dans le bassin en fonctionnement, une garde d'eau d'une hauteur prédéterminée qui correspond à la totalité de la hauteur de la couche inférieure, et en ce que la couche supérieure présente une hauteur H2 > 30 cm.These objectives, as well as others which will appear later, are achieved thanks to the invention which has for object a wastewater treatment device of the plant filter type in which the circulation of the wastewater is at vertical flow, the device comprising a purification basin for receiving wastewater, the basin comprising at least two superposed layers of filtering material:
  • a lower saturated layer of water located in the bottom of the basin and comprising drainage means;
  • an unsaturated upper water layer above the lower layer, the upper layer having passive aeration means, the passive aeration means comprising a network of aeration drains located at the bottom of the upper layer;
characterized in that the device comprises an active aeration system of the saturated lower layer, the active aeration system being located in the bottom of the lower layer and being distributed essentially over the entire surface covered by the lower layer of the lower pool. purification, the active aeration system being intended to homogeneously aerate the entire lower layer, the active aeration system of the saturated lower layer being an intermittent active aeration system,
in that the device comprises means of water retention able to maintain, in the basin in operation, a water guard of a height predetermined that corresponds to the entire height of the lower layer, and in that the upper layer has a height H2> 30 cm.

L'expression « moyens d'aération passive » désigne par exemple l'apport d'02 excrété par les racines des plantes ou encore la diffusion depuis la surface. Ces systèmes permettent de maintenir la couche supérieure non saturée en eaux en condition aérobie.The expression "passive aeration means" designates, for example, the supply of 02 excreted by the roots of the plants or the diffusion from the surface. These systems make it possible to maintain the unsaturated upper layer in water under aerobic conditions.

La couche supérieure non saturée ainsi réalisée permet au filtre de favoriser le traitement des matières solides particulaires retenues en surface et de ne pas nécessiter un prétraitement particulier pour éliminer au moins une grande partie de ces dernières.The unsaturated upper layer thus produced allows the filter to promote the treatment of particulate solids retained on the surface and not to require special pretreatment to remove at least a large portion of the latter.

En effet, un tel prétraitement, par exemple réalisé par une fosse septique, un décanteur digesteur ou encore un réacteur anaérobie, oblige à une extraction régulière de boues non déshydratées et souvent peu minéralisées, qui oblige souvent à un traitement complémentaire avant une revalorisation agricole, entraînant des contraintes et coûts d'exploitation élevés.Indeed, such pretreatment, for example carried out by a septic tank, a settling digester or an anaerobic reactor, requires a regular extraction of undehydrated sludge and often little mineralized, which often requires additional treatment before agricultural revalorization, resulting in high operating costs and constraints.

Grâce au principe de l'invention, la couche inférieure permet un traitement avantageux de la pollution dissoute. En effet, le système d'aération actif permet d'augmenter les cinétiques de dégradation, en particulier pour les effluents fortement chargés en pollution dissoute organique et azotée.Thanks to the principle of the invention, the lower layer provides an advantageous treatment of dissolved pollution. In fact, the active aeration system makes it possible to increase the kinetics of degradation, in particular for effluents heavily loaded with dissolved organic and nitrogen pollution.

Le dispositif de traitement selon l'invention est adapté au traitement d'eaux usées domestiques rejetées par une collectivité mais aussi pour le traitement des eaux usées rejetées par une habitation de type individuelle. Il peut également être appliqué pour le traitement d'effluents industriels, ou agricoles. En particulier, ce dispositif est avantageusement adapté au traitement d'effluents fortement chargés en matière organique et contenant des matières particulaires telles que générées par les industries agroalimentaires (industrie de la viande, industrie des fruits et légumes, boulangerie/pâtisserie industrielle, fromagerie/industrie laitière, cave vinicole...).The treatment device according to the invention is suitable for the treatment of domestic wastewater discharged by a community but also for the treatment of wastewater discharged by an individual dwelling. It can also be applied for the treatment of industrial or agricultural effluents. In particular, this device is advantageously adapted to the treatment of effluents heavily loaded with organic matter and containing particulate matter as generated by the food industry (meat industry, fruit and vegetable industry, bakery / industrial pastry, cheese / industry dairy, wine cellar ...).

Un dispositif de traitement selon l'invention permet ainsi de traiter des effluents fortement chargés avec un seul bassin, d'où une emprise foncière réduite.A treatment device according to the invention thus makes it possible to treat highly charged effluents with a single basin, hence a reduced land footprint.

De plus, le dispositif permet le traitement d'effluents domestiques et d'effluents industriels ou agricoles contenant des matières particulaires, sans prétraitement (excepté un dégrillage grossier), tout en assurant des rendements élevés sur les paramètres MES, DCO, DBO5, NTK, ainsi que sur l'azote global.In addition, the device allows the treatment of domestic effluents and industrial or agricultural effluents containing particulate matter, without pretreatment (except a rough screening), while ensuring high yields on the parameters MES, DCO, BOD 5 , NTK , as well as on global nitrogen.

Il est en outre à noter que, l'invention conserve certains avantages des filtres plantés : bonne intégration paysagère, entretien facile et peu coûteux, faible production de boues, consommation d'énergie plus faible que les procédés « intensifs » type boues activées, pas de consommation de produits chimiques, performances épuratoires élevées et une bonne adaptation aux variations de charge.It should also be noted that the invention retains certain advantages of planted filters: good landscape integration, easy and inexpensive maintenance, low sludge production, lower energy consumption than "intensive" activated sludge type processes, no consumption of chemicals, high purification performance and good adaptation to load variations.

La hauteur minimum H2 de la couche supérieure est particulièrement importante, notamment afin de favoriser la déshydratation des matières particulaires par un mécanisme de drainage. En effet, la déshydratation des matières particulaires favorisée grâce à cette caractéristique permet au dispositif selon l'invention de s'affranchir des prétraitements retrouvés dans les solutions proposées par l'art antérieur.The minimum height H2 of the upper layer is particularly important, in particular to promote the dehydration of particulate matter by a drainage mechanism. Indeed, the dehydration of particulates favored by this feature allows the device according to the invention to overcome pretreatments found in the solutions proposed by the prior art.

Le réseau de drains d'aération est particulièrement adapté dans le cas des effluents chargés en matières particulaires, dans le but de favoriser le traitement des matières particulaires retenues en surface par des mécanismes de déshydratation par drainage et de minéralisation aérobie.The drains network is particularly suitable for particulate matter-laden effluents, with the goal of promoting the treatment of particulate matter retained at the surface by drainage dewatering and aerobic mineralization mechanisms.

Grâce au système d'aération actif situé dans le fond de la couche inférieure et qui est réparti essentiellement sur toute la surface couverte par la couche inférieure, les cinétiques de dégradation dans la couche inférieure saturée peuvent ainsi être homogènes dans ladite couche inférieure.Thanks to the active aeration system located in the bottom of the lower layer and which is distributed essentially over the entire surface covered by the lower layer, degradation kinetics in the saturated lower layer can thus be homogeneous in said lower layer.

L'expression « système d'aération actif » désigne bien entendu un système d'aération dans lequel l'air est approvisionné de manière active, par exemple à l'aide de moyens qui peuvent prendre la forme de pompes, de ventilateurs ou encore de surpresseurs.The expression "active aeration system" of course refers to a ventilation system in which the air is actively supplied, for example by means which may take the form of pumps, fans or superchargers.

Selon une caractéristique particulière, le bassin de purification comporte des systèmes d'apport d'eaux usées par bâchées.According to a particular characteristic, the purification basin comprises systems for supplying wastewater by sheeting.

Un tel système d'apport d'eaux usées permet d'améliorer l'oxygénation de la couche supérieure. En effet, l'arrivée des effluents se faisant de manière discontinue (par « bâchée ») on retrouve un effet de convection, liée à l'effet piston du déplacement des lames d'eau apportées à chaque bâchée. De plus, ce système permet d'obtenir une bonne répartition des eaux usées sur toute la surface du bassin de purification.Such a wastewater supply system improves the oxygenation of the upper layer. Indeed, the arrival of the effluents being done in a discontinuous manner (by "tarpaulin") we find a convection effect, related to the piston effect of the displacement of the water strips made to each tarpaulin. In addition, this system provides a good distribution of wastewater over the entire surface of the purification tank.

Le système d'aération actif de la couche inférieure saturée est un système d'aération actif intermittent.The active aeration system of the saturated bottom layer is an intermittent active aeration system.

Le système d'aération ainsi conçu permet d'une part de réduire la consommation d'énergie, et d'autre part d'améliorer le traitement de l'azote global en favorisant les réactions de nitrification et dénitrification.The ventilation system thus designed makes it possible on the one hand to reduce energy consumption and, on the other hand, to improve the treatment of global nitrogen by promoting nitrification and denitrification reactions.

Selon un mode de réalisation particulier de l'invention, le système d'aération actif intermittent comporte un programmateur horaire.According to a particular embodiment of the invention, the intermittent active aeration system comprises a timer.

Par exemple, le système peut être programmé pour réaliser des cycles d'une heure d'aération suivie d'une heure d'arrêt de l'aération.For example, the system can be programmed to cycle one hour of ventilation followed by one hour of aeration stop.

Selon un mode de réalisation préférentiel, le dispositif comporte des capteurs destinés à déterminer des paramètres d'oxygène dissous et/ou de potentiel d'oxydo-réduction dans la couche inférieure, et le système d'aération actif intermittent comporte un interrupteur automatique couplé aux capteurs.According to a preferred embodiment, the device comprises sensors for determining dissolved oxygen parameters and / or oxidation-reduction potential in the lower layer, and the intermittent active aeration system comprises an automatic switch coupled to sensors.

Selon une caractéristique avantageuse, le dispositif de traitement des eaux usées comprend une pluralité de bassins de purification montés en parallèle.According to an advantageous characteristic, the wastewater treatment device comprises a plurality of purification tanks connected in parallel.

Préférentiellement, les systèmes d'aération actifs intermittents de la couche inférieure saturée de chaque bassin de purification forment un réseau d'aération, et le réseau d'aération comporte des moyens d'alimentation en air en alternance des systèmes d'aération actifs intermittents.Preferentially, the intermittent active aeration systems of the saturated lower layer of each purification tank form an aeration network, and the aeration network comprises alternating air supply means of intermittent active aeration systems.

Ces moyens d'alimentation en air en alternance peuvent prendre la forme de pompes, de ventilateurs ou encore de surpresseurs qui alimentent alternativement les systèmes d'aération grâce à des vannes.These alternating air supply means may take the form of pumps, fans or boosters that alternately feed the aeration systems through valves.

Selon une autre caractéristique avantageuse, les systèmes d'apport d'eaux usées de chaque bassin de purification forment un réseau d'apport d'eaux usées, le réseau d'apport d'eaux usées comportant des moyens d'alimentation en alternance des systèmes d'apport d'eaux usées.According to another advantageous characteristic, the wastewater supply systems of each purification basin form a sewage supply network, the sewage supply network comprising means for alternately feeding the wastewater systems. of wastewater.

Les moyens d'alimentation en alternance des systèmes d'apport permettent notamment d'avoir des périodes de repos favorables à la déshydratation et la minéralisation des matières particulaires retenues en surface. De plus, un tel dispositif comportant une pluralité de bassins de purification permet ainsi de traiter un flot continu d'eaux usées tout en permettant l'application de ces périodes de repos.The alternating feeding means of the delivery systems allow in particular to have rest periods favorable to the dehydration and mineralization of particulate matter retained on the surface. In addition, such a device comprising a plurality of purification tanks and can treat a continuous stream of wastewater while allowing the application of these periods of rest.

D'autres caractéristiques et avantages de l'invention apparaîtront plus clairement à la lecture de la description suivante de modes de réalisation préférentiels de l'invention, donnés à titre d'exemples illustratifs et non limitatifs, et des dessins annexés parmi lesquels :

  • la figure 1 est une représentation schématique selon une vue de côté du dispositif de traitement des eaux usées selon l'invention ;
  • la figure 2 est une représentation schématique selon une vue de dessus du dispositif de traitement des eaux usées selon l'invention.
Other features and advantages of the invention will appear more clearly on reading the following description of preferred embodiments of the invention, given by way of illustrative and nonlimiting examples, and the appended drawings among which:
  • the figure 1 is a schematic representation in a side view of the wastewater treatment device according to the invention;
  • the figure 2 is a schematic representation in a view from above of the wastewater treatment device according to the invention.

Tel que représenté sur les figures 1 et 2, le dispositif 1 de traitement des eaux usées est de type filtre planté à percolation verticale (impliquant par définition une circulation des eaux usées dans le dispositif selon un écoulement vertical).As shown on the figures 1 and 2 the wastewater treatment device 1 is of the vertical percolation filter type (which by definition involves a circulation of the wastewater in the device according to a vertical flow).

Le dispositif 1 comprend un bassin de purification 10.The device 1 comprises a purification tank 10.

Sur les figures 1 et 2, le bassin de purification dispose :

  • d'une entrée d'eaux usées non traitées E ;
  • d'une entrée d'air A ;
  • d'une sortie d'eaux usées traitées S.
On the figures 1 and 2 , the purification basin has:
  • an untreated wastewater inlet E;
  • an air inlet A;
  • an outlet of treated wastewater S.

Tel qu'illustré sur la figure 1, un complexe d'étanchéité 9 se situe sur les côtés et le fond du bassin. Il prend la forme, par exemple, d'une géomembrane de polyéthylène haute densité (PEHD), posée sur un géotextile anti-poinçonnement.As illustrated on the figure 1 , a sealing complex 9 is located on the sides and the bottom of the basin. It takes the form, for example, of a geomembrane of high density polyethylene (HDPE), placed on an anti-punching geotextile.

Des bordures 90 sont également disposées autour du bassin, ces bordures peuvent être en polypropylène, en bois ou en béton. Elles permettent notamment de protéger le filtre des eaux de ruissellement et de protéger le complexe d'étanchéité des dégradations extérieures (UV, rongeurs, malveillance...).Edges 90 are also arranged around the basin, these borders may be polypropylene, wood or concrete. In particular, they make it possible to protect the filter from run-off water and to protect the sealing complex from external damage (UV, rodents, malevolence, etc.).

Le bassin de purification 10 comporte au moins deux couches superposées de matériaux filtrants : une couche inférieure 100 et une couche supérieure 101 située au-dessus de la couche inférieure.The purification tank 10 comprises at least two superposed layers of filtering materials: a lower layer 100 and an upper layer 101 located above the lower layer.

Dans la couche supérieure de matériaux filtrants, des végétaux 8 sont plantés pour favoriser la déshydratation des matériaux particulaires retenus en surface, aider au maintien de la perméabilité du filtre et favoriser l'activité microbienne aérobie à proximité des racines et rhizomes. Ces végétaux sont par exemple des végétaux de type Phragmite, Glyceria, Scirpus, Phalaris. In the upper layer of filter materials, plants are planted to promote the dehydration of surface-retained particulate materials, help maintain filter permeability, and promote aerobic microbial activity near roots and rhizomes. These plants are for example plants of the type Phragmite, Glyceria, Scirpus, Phalaris.

Cette couche supérieure 101 est non saturée en eau. Elle comporte des moyens d'aération passive. Ces moyens d'aération passive comprennent un réseau de drains d'aération 4 situé au fond de la couche supérieure.This upper layer 101 is unsaturated with water. It comprises means of passive aeration. These passive aeration means comprise a network of ventilation drains 4 located at the bottom of the upper layer.

La couche inférieure 100 est saturée en eaux et située dans le fond du bassin. Cette couche inférieure comprend des moyens de drainage des eaux usées traitées.The lower layer 100 is saturated in water and located in the bottom of the basin. This lower layer comprises means for draining the treated wastewater.

Le dispositif comprend aussi des moyens de rétention d'eau 2 apte à maintenir, dans le bassin en fonctionnement, une garde d'eau d'une hauteur prédéterminée qui correspond à la totalité de la hauteur de la couche inférieure 100.The device also comprises water retention means 2 adapted to maintain, in the basin in operation, a water of a predetermined height that corresponds to the entire height of the lower layer 100.

Tel qu'illustré par les figures, le dispositif 1 comprend un système d'aération actif 3 de la couche inférieure saturée. Ce système d'aération actif est situé dans le fond de la couche inférieure et s'étend sur essentiellement toute la surface couverte par la couche inférieure du bassin de purification.As illustrated by the figures, the device 1 comprises an active aeration system 3 of the saturated lower layer. This active aeration system is located in the bottom of the lower layer and extends over substantially the entire surface covered by the lower layer of the purification tank.

Selon des modes de réalisation particuliers, le système d'aération actif de la couche inférieure saturée est un système intermittent pouvant par exemple comprendre :

  • un programmateur horaire ;
  • un interrupteur automatique couplé à des capteurs situé dans le dispositif de traitement et destinés à déterminer des paramètres d'oxygène dissous et/ou de potentiel d'oxydo-réduction dans la couche inférieure.
According to particular embodiments, the active aeration system of the saturated lower layer is an intermittent system which may for example comprise:
  • a time programmer;
  • an automatic switch coupled to sensors located in the processing device and for determining dissolved oxygen parameters and / or oxidation reduction potential in the lower layer.

Le bassin de purification comporte des systèmes d'apport d'eaux usées 5 par bâchées.The purification basin comprises wastewater delivery systems 5 by tarpaulins.

Le dispositif peut comporter un ou plusieurs bassins de purification montés en parallèle.The device may comprise one or more purification tanks connected in parallel.

Dans le cas de plusieurs bassins en parallèle, ceux-ci peuvent être alimentés en eaux usées en alternance : les systèmes d'apport d'eaux usées de chaque bassin forment un réseau d'apport d'eaux usées comportant des moyens d'alimentation en alternance desdits systèmes d'apport. Par exemple, ces moyens d'alimentation en alternance consistent en des vannes manuelles ou automatiques, disposées entre le système d'alimentation (chasse automatique ou poste de relevage) et les bassins. Cette alternance permet notamment d'avoir des périodes de repos favorables à la déshydratation et la minéralisation des matières particulaires retenues en surface.In the case of several basins in parallel, these can be supplied with alternating wastewater: the wastewater supply systems of each basin form a sewage supply network comprising means for supplying wastewater. alternation of said delivery systems. For example, these alternating power supply means consist of manual or automatic valves, arranged between the feeding system (automatic flushing or lifting station) and the basins. This alternation makes it possible, in particular, to have rest periods favorable to the dehydration and the mineralization of the particulate matter retained on the surface.

Toujours dans le cas de plusieurs bassins en parallèle, le réseau d'aération artificielle (formé par les systèmes d'aération intermittents de la couche inférieure saturée de chaque bassin) peut également être alimenté en alternance : le réseau d'aération comportant des moyens d'alimentation en air en alternance des systèmes d'aération. Par exemple, les moyens d'alimentation en air en alternance prennent la forme de vannes manuelles ou automatiques, disposées entre le système de distribution d'air (pompe, ventilateur, surpresseur) et les bassins.Still in the case of several basins in parallel, the artificial aeration network (formed by the intermittent aeration systems of the saturated lower layer of each basin) can also be supplied alternately: the aeration network comprising means alternating air supply of the ventilation systems. For example, the alternating air supply means take the form of manual or automatic valves, arranged between the air distribution system (pump, fan, booster) and the basins.

Un dispositif de traitement des eaux usées selon l'invention peut fonctionner et être adapté de la manière décrite ci-après.A wastewater treatment device according to the invention can operate and be adapted as described below.

Le dispositif peut être alimenté avec des eaux usées brutes préalablement dégrillées (maille de 20 à 30 mm) pour éliminer les déchets les plus grossiers. Les eaux usées sont ensuite envoyées en surface du bassin en fonctionnement, grâce à une rampe d'alimentation des systèmes d'apport d'eaux usées 5 qui peut être aérienne ou enterrée (telle que représentée sur la figure 1). Afin d'avoir une bonne répartition sur toute la surface, le réseau d'alimentation formé par les systèmes d'apport est composé d'une nourrice principale 50 et de plusieurs diffuseurs 51, en dessous desquels sont installées des plaques anti-affouillement 6. Dans le cas d'une rampe d'alimentation enterrée, un regard de contrôle 500 peut être monté à l'extrémité de la nourrice principale, afin de permettre la vidange de la conduite, et éventuellement son nettoyage.The device can be fed with raw wastewater previously screened (mesh size of 20 to 30 mm) to eliminate the coarsest waste. The wastewater is then sent to the surface of the basin in operation, by means of a feed ramp of the wastewater supply systems 5 which can be aerial or underground (as represented on the figure 1 ). In order to have a good distribution over the entire surface, the supply network formed by the delivery systems is composed of a main feeder 50 and several diffusers 51, below which are installed anti-scouring plates 6. In the case of a buried feed ramp, a control eye 500 can be mounted at the end of the main nanny, to allow the emptying of the pipe, and possibly cleaning.

L'arrivée des effluents se fait de manière discontinue, par « bâchée », ce qui favorise une bonne répartition sur toute la surface et une meilleure oxygénation de la couche supérieure 101 non saturée par convection. L'alimentation par bâchée peut être obtenue par une chasse automatique fonctionnant sans énergie si le dénivelé le permet. Dans le cas de terrains sans pente ou à pente très faible, l'alimentation comporte un poste de relevage contenant au moins une pompe.The arrival of effluents is discontinuous, by "tarpaulin", which promotes a good distribution over the entire surface and better oxygenation of the upper layer 101 unsaturated by convection. The feeding by tarpaulin can be obtained by an automatic hunt operating without energy if the altitude allows it. In the case of land without slope or very low slope, the power supply includes a lifting station containing at least one pump.

Les eaux usées percolent verticalement dans la couche supérieure non saturée du bassin constituée, par exemple, d'au moins deux sous-couches de gravier de granulométrie différente. On a par exemple une première sous-couche 1010 de granulométrie de 2 à 6 mm en surface, sur une hauteur comprise de 15 à 40 cm, puis une deuxième sous-couche 1011, située en-dessous de la première sous-couche, de granulométrie plus grossière de 4 à 20 mm sur une hauteur de 15 à 30 cm. La couche supérieure présente ainsi une hauteur H2 ≥ 30 cm. De plus, une couche de compost 102 de 5 à 15 cm de hauteur peut également être ajoutée en surface, afin d'améliorer les performances de filtration et favoriser la croissance des roseaux au démarrage.The wastewater percolates vertically in the unsaturated upper layer of the basin consisting for example of at least two sub-layers of gravel of different grain size. For example, there is a first sub-layer 1010 with a particle size of 2 to 6 mm at the surface, at a height of between 15 and 40 cm, then a second underlayer 1011, located below the first underlayer, of coarser grain size of 4 to 20 mm over a height of 15 to 30 cm. The upper layer thus has a height H 2 ≥ 30 cm. In addition, a layer of compost 102 5 to 15 cm high can also be added to the surface, to improve filtration performance and promote the growth of reeds at startup.

Le réseau de drains d'aération 4 reliés à au moins une cheminée 40 d'aération passive peut être positionné au bas de cette couche supérieure afin de contribuer à la maintenir en condition aérobie, y compris pendant les phases d'arrêt de l'aération artificielle par le système d'aération actif de la couche inférieure saturée.The network of ventilation drains 4 connected to at least one passive venting chimney 40 can be positioned at the bottom of this upper layer in order to contribute to maintaining it in aerobic condition, including during the phases of stopping the aeration. artificial by the active aeration system of the saturated lower layer.

Le réseau de drains d'aération 4 est particulièrement recommandé dans le cas d'un effluent chargé en matières particulaires, afin de favoriser le traitement des matières particulaires retenues en surface par des mécanismes de déshydratation par drainage et de minéralisation aérobie.Aeration drains 4 are particularly recommended in the case of particulate matter effluent to support the treatment of particulate matter retained at the surface by drainage dewatering and aerobic mineralization mechanisms.

Les eaux usées partiellement traitées atteignent ensuite la couche inférieure 100 saturée en eaux disposant d'une aération artificielle au moyen du système d'aération actif. Le niveau de l'eau est maintenu grâce aux moyens de rétention d'eau 2 qui prennent la forme d'un regard de mise en charge 6 en sortie. Cette couche inférieure est constituée d'au moins une sous-couche de gravier de granulométrie de 10 à 40 mm sur une hauteur H1 de 40 à 150 cm.The partially treated wastewater then reaches the lower saturated layer 100 in water with artificial aeration through the active aeration system. The water level is maintained by means of the water retention means 2 which take the form of a look of charge 6 output. This lower layer consists of at least one gravel sub-layer with a particle size of 10 to 40 mm over a height H1 of 40 to 150 cm.

Le système d'aération actif 3 est positionné dans le fond du bassin et comporte un réseau de distribution d'air composé de plusieurs tuyaux percés permettant une distribution homogène de l'air sur toute la surface de la couche inférieure. Les tuyaux peuvent par exemple être des tuyaux avec goutteurs auto-régulants qui assurent une distribution uniforme, même sur de grandes longueurs, et présentent une grande résistance au colmatage. L'oxygène présent dans l'air envoyé dans le fond du bassin est diffusé dans la phase liquide de la couche inférieure saturée et est ainsi disponible pour des dégradations microbiennes aérobies. Les moyens d'alimentation en air peuvent par exemple comprendre une pompe, un ventilateur ou un surpresseur. Le débit d'air est compris entre 0,1 et 1,5 Nm3/m2.h selon la charge polluante à traiter.The active aeration system 3 is positioned in the bottom of the basin and has an air distribution network composed of several drilled pipes allowing a homogeneous distribution of air over the entire surface of the lower layer. The pipes may for example be pipes with self-regulating drippers which ensure uniform distribution, even over long lengths, and have a high resistance to clogging. The oxygen present in the air sent into the bottom of the basin is diffused into the liquid phase of the saturated lower layer and is thus available for aerobic microbial degradations. The air supply means may for example comprise a pump, a fan or a booster. The air flow rate is between 0.1 and 1.5 Nm 3 / m 2 .h depending on the pollutant load to be treated.

Tel qu'expliqué précédemment, le système d'aération peut être un système intermittent.As explained above, the aeration system may be an intermittent system.

Les eaux traitées sont ensuite récupérées par les moyens de drainage via au moins un drain de collecte transversal 7 (tel que représenté sur la figure 1) relié à une canalisation d'évacuation 70 qui débouche sur le regard de mise en charge 6. Ce regard est muni d'un coude avec une sortie d'eau dont le niveau peut être réglable (entre le fond du bassin et le niveau haut de la couche inférieure saturée, correspondant au niveau bas du drain d'aération passive intermédiaire si existant). Un bouchon de vidange 71 à la base du coude permet de vidanger si nécessaire la couche inférieure saturée, par exemple en cas de défaut d'aération artificielle (coupure électrique, panne du compresseur...), afin de prévenir des risques d'anoxie prolongée en cas d'effluents fortement chargés et des risques de colmatage. Les moyens de drainage peuvent également être connectés aux cheminées 40 d'aération passive.The treated water is then recovered by the drainage means via at least one transverse collection drain 7 (as shown on the figure 1 ) This connection is provided with an elbow with a water outlet whose level can be adjustable (between the bottom of the basin and the high level) of the saturated lower layer, corresponding to the low level of the intermediate passive aeration drain if existing). A drain plug 71 at the base of the elbow makes it possible to empty the saturated lower layer if necessary, for example in the event of a lack of artificial aeration (electrical failure, compressor failure, etc.), in order to prevent risks of anoxia. prolonged in case of heavily loaded effluents and the risk of clogging. The drainage means may also be connected to the passive ventilation chimneys 40.

Les eaux traitées sont ensuite évacuées vers le milieu naturel (rivière, fossé, lac, mer...), en infiltration souterraine, vers une zone de stockage pour réutilisation, ou encore vers un traitement de finition.The treated water is then discharged to the natural environment (river, ditch, lake, sea ...), underground infiltration, to a storage area for reuse, or to a finishing treatment.

La capacité d'un tel dispositif de traitement selon l'invention peut être augmentée en prévoyant un filtre de surface supérieure, ou en ajoutant un ou plusieurs filtres ou ensembles de filtres supplémentaires, alimentés en parallèle et/ou en alternance.The capacity of such a processing device according to the invention can be increased by providing an upper surface filter, or by adding one or more filters or additional filter sets, fed in parallel and / or alternately.

Selon des variantes envisageables, les différentes couches de graviers de différentes granulométries peuvent être remplacées par d'autres types de matériaux filtrant, permettant la fixation et le développement des bactéries épuratrices et/ou avec des propriétés chimiques permettant l'élimination de certains polluants :

  • matériaux poreux présentant une surface spécifique élevée, comme le schiste ou l'argile expansée ;
  • matériaux présentant des propriétés d'échange d'ions comme la zéolithe, avec notamment la capacité de retenir les ions ammonium (NH4 +);
  • matériaux permettant la précipitation et/ou l'adsorption des phosphates comme les laitiers d'aciéries, l'apatite ;
  • matériaux permettant l'apport de carbone pour la dénitrification, comme les copeaux de bois ou autres dérivés de produits organiques ;
  • matériaux apportant de l'alcalinité pour tamponner le pH.
According to possible variants, the different layers of gravel of different particle sizes may be replaced by other types of filter materials, allowing the attachment and development of purifying bacteria and / or with chemical properties allowing the elimination of certain pollutants:
  • porous materials with a high surface area, such as shale or expanded clay;
  • materials having ion exchange properties such as zeolite, including the ability to retain ammonium ions (NH 4 + );
  • materials for precipitating and / or adsorbing phosphates such as steelmaking slags, apatite;
  • carbon-enabling materials for denitrification, such as wood chips or other organic products;
  • materials providing alkalinity to buffer the pH.

Selon la composition de l'effluent à traiter, le dispositif de traitement des effluents peut comporter des éléments supplémentaires, en amont ou en aval. En amont, le dispositif peut comprendre, par exemple, un dispositif de dégraissage, un réservoir de stockage, un dispositif de neutralisation des effluents et/ou un système d'ajout de nutriments afin d'améliorer la biodégradabilité de l'effluent. En aval, le dispositif peut comprendre, par exemple, un dispositif de désinfection, un filtre à sable, un dispositif de déphosphatation et/ou une zone de rejet végétalisée.Depending on the composition of the effluent to be treated, the effluent treatment device may comprise additional elements, upstream or downstream. Upstream, the device may comprise, for example, a degreasing device, a storage tank, an effluent neutralization device and / or a nutrient addition system to improve the biodegradability of the effluent. Downstream, the device may comprise, for example, a disinfection device, a sand filter, a dephosphatation device and / or a planted rejection zone.

Claims (7)

  1. Device (1) for the treatment of wastewater of the vertical flow constructed wetland type, the device comprising a purification basin (10) intended to receive wastewater, the basin comprising at least two superimposed layers of filtering materials:
    - a water-saturated lower layer (100) located at the bottom of the basin and comprising draining means;
    - a non-water-saturated upper layer (101) located above the lower layer, the upper layer comprising passive aeration means, the passive aeration means comprising a network of aeration drains (4) located at the bottom of the upper layer;
    characterized in that, the device comprises an active aeration system (3) of the lower saturated layer, the active aeration system (3) being located at the bottom of the lower layer and being distributed basically over the entire surface covered by the lower layer of the purification basin, the active aeration system being intended to aerate in a uniform manner the entire lower layer, the active aeration system (3) of the lower saturated layer (100) being an intermittent aeration system,
    in that the device comprises water-retention means (2) capable of maintaining, in the basin during operation, a water seal of a predetermined height that corresponds to the full height of the lower layer,
    and in that the upper layer has a height H2 > 30 cm.
  2. Device (1) for the treatment of wastewater according to claim 1, characterized in that the purification basin (10) comprises systems for supplying wastewater (5) by tankful.
  3. Device (1) for the treatment of wastewater according to claim 1, characterized in that the intermittent active aeration system comprises a timer.
  4. Device (1) for the treatment of wastewater according to claim 1, characterized in that it comprises sensors intended to determine parameters of dissolved oxygen and/or of oxidation/reduction potential in the lower layer (100), and in that the intermittent active aeration system comprises an automatic switch connected to the sensors.
  5. Device (1) for the treatment of wastewater according to any of the preceding claims, characterized in that it comprises a plurality of purification basins (10) mounted in parallel.
  6. Device (1) for the treatment of wastewater according to claim 3 or 5, characterized in that the intermittent active aeration systems of the saturated lower layer of each purification basin (10) form an aeration network, in that the aeration network comprises means to supply air alternately to the intermittent active aeration systems.
  7. Device (1) for the treatment of wastewater according to claim 2 and claims 5 or 6, characterized in that the systems for the intake of waste water (5) of each purification basin (10) form a wastewater intake network, the wastewater intake network comprising means to supply the wastewater intake systems alternately.
EP16702755.6A 2015-01-09 2016-01-08 Sewage treatment device, such as a vertical-percolation planted filter, comprising a system for active aeration of a saturated lower layer Active EP3242859B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR1550180A FR3031516B1 (en) 2015-01-09 2015-01-09 VERTICAL PERCOLATION PLANT FILTER TYPE WASTE TREATMENT DEVICE COMPRISING AN ACTIVE AERATION SYSTEM OF A SATURATED LOWER LAYER
PCT/FR2016/050033 WO2016110657A1 (en) 2015-01-09 2016-01-08 Sewage treatment device, such as a vertical-percolation planted filter, comprising a system for active aeration of a saturated lower layer

Publications (2)

Publication Number Publication Date
EP3242859A1 EP3242859A1 (en) 2017-11-15
EP3242859B1 true EP3242859B1 (en) 2019-05-08

Family

ID=52692915

Family Applications (1)

Application Number Title Priority Date Filing Date
EP16702755.6A Active EP3242859B1 (en) 2015-01-09 2016-01-08 Sewage treatment device, such as a vertical-percolation planted filter, comprising a system for active aeration of a saturated lower layer

Country Status (4)

Country Link
EP (1) EP3242859B1 (en)
CN (1) CN107207298A (en)
FR (1) FR3031516B1 (en)
WO (1) WO2016110657A1 (en)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR3035395B1 (en) 2015-04-24 2021-09-24 Epur Nature WASTEWATER AND USES TREATMENT DEVICE
FR3076829B1 (en) * 2018-01-15 2021-12-10 Opure DEVICE AND METHOD FOR TREATING WASTE WATER, INTEGRATING A PURIFICATION BASIN OF PLANT FILTER TYPE AND A BIOLOGICAL REACTOR
FR3077071B1 (en) * 2018-01-22 2023-06-02 Opure WASTEWATER TREATMENT DEVICE
CN110526409A (en) * 2019-09-09 2019-12-03 上海环境绿色生态修复科技有限公司 A kind of vertical multi-stage constructed wetland device
CN111517567B (en) * 2020-04-17 2022-09-27 济宁玉园生物科技有限公司 Ecological environment restoration system with automatic blockage clearing function and restoration method
MA49998B1 (en) 2020-06-08 2022-03-31 Univ Sidi Mohamed Ben Abdellah Device for the treatment of waste water by vetiver zizania filters and biochar with ascending flow with forced aeration by adjustable oxygen injection rods
FR3124955B1 (en) 2021-07-12 2024-02-16 3E Device for creating a liquid mixture from at least two streams of liquid fluids

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4225699C1 (en) * 1992-08-04 1994-01-20 Hermann Dipl Ing Rehnen Biological waste water purificn. - in layered clarification plant having compressed air and external organic carbon surface
US6652743B2 (en) * 1997-06-23 2003-11-25 North American Wetland Engineering, Inc. System and method for removing pollutants from water
AT508098B1 (en) * 2009-03-20 2015-06-15 Hackner Heinz DEVICE FOR CLEANING WATER FROM SWIMMING POOLS OR POOLS
FR2973796B1 (en) * 2011-04-06 2013-04-19 Voisin J DEVICE FOR TREATING WASTEWATER
CN202063799U (en) * 2011-04-27 2011-12-07 安徽南风环境工程技术有限公司 High-efficiency multifunctional wastewater treatment system
CN102633362B (en) * 2012-01-09 2013-10-16 中国环境科学研究院 Artificial wetland sewage treatment device capable of running continuously at low temperature
CA2777470A1 (en) * 2012-05-16 2013-11-16 Quaestor B.V.B.A. Device for the purification of sanitary waste water

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None *

Also Published As

Publication number Publication date
FR3031516B1 (en) 2018-09-14
CN107207298A (en) 2017-09-26
WO2016110657A1 (en) 2016-07-14
EP3242859A1 (en) 2017-11-15
FR3031516A1 (en) 2016-07-15

Similar Documents

Publication Publication Date Title
EP3242859B1 (en) Sewage treatment device, such as a vertical-percolation planted filter, comprising a system for active aeration of a saturated lower layer
EP1791793B1 (en) Method for treating pollutants by phytoleaching
EP1857419B1 (en) Method and installation for processing effluents
FR2942791A1 (en) Device for cleaning wastewater, comprises a purification tank for receiving wastewater, a ventilation unit disposed in bottom of the tank and covered by a lower layer, and a plantation including aquatic plants such as reeds
WO2021251811A1 (en) Device for treating wastewater by vetiver zizania and biochar filters
KR100880535B1 (en) Upflow microorganism contact filtration
FR2973796A1 (en) Vertical flow device, useful for treatment of nitrogen containing wastewater, comprises purification tank for receiving wastewater, water retention unit, recirculation unit adapted to supply tank with the treated water, and supply unit
US10526222B2 (en) Wastewater purification device and utilizations
FR3025510A1 (en) PROCESS FOR TREATING INDUSTRIAL WASTE WATER BY COUPLING A BIOLOGICAL REACTOR BY CULTURE FIXED ON MOBILE MEDIA AND A MACROPHYTE FILTER
EP1674430B1 (en) Apparatus for the treatment of wastewater and process using it
EP1200361B1 (en) Method for purifying domestic, agricultural and industrial wastewater
JP2004154668A (en) Resource recovery type sewage purification method and apparatus using the same
EP4007741A1 (en) Waste water treatment plant
WO2015107174A1 (en) Wastewater treatment device
FR3077071A1 (en) DEVICE FOR TREATING WASTEWATER
BE1013375A3 (en) PROCESS AND PLANT FOR THE NITRIFICATION OF POLLUTED WATER. &#39;
FR2906239A1 (en) BASIN FOR THE TREATMENT OF WASTE WATER BY BEDS WITH MACROPHYTES.
FR3076829A1 (en) DEVICE AND METHOD FOR TREATING WASTEWATER, INTEGRATING A PLANT FILTER TYPE PURIFICATION BASIN AND A BIOLOGICAL REACTOR
EP3214049A1 (en) Device for treating wastewater comprising a microbiological bed
FR2828189A1 (en) Treatment of effluents from noncollective sanitation units comprises stripping off volatile and odorous compounds and treating them in a trickle biofilter, and treating the remaining effluent in a reed bed
KR100609762B1 (en) Processing method for sewage purification and equipment therefor
WO2021160644A1 (en) Phyto-purification method and apparatus for treating wastewater
FR3129389A1 (en) Wastewater treatment device by planted filter equipped with a flushing or post-type structure
FR2966141A1 (en) Dephosphatation unit useful in a wastewater treatment device such as a planted filter for the removal of phosphorus from the wastewater, comprises an electric arc furnace slag in the form of aggregates
FR2821346A1 (en) Waste water denitrification procedure uses hydrolysis, pozzolana/ bacterial reactor and aerobic zeolite filter

Legal Events

Date Code Title Description
STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE INTERNATIONAL PUBLICATION HAS BEEN MADE

PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: REQUEST FOR EXAMINATION WAS MADE

17P Request for examination filed

Effective date: 20170721

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR

AX Request for extension of the european patent

Extension state: BA ME

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: EXAMINATION IS IN PROGRESS

DAV Request for validation of the european patent (deleted)
DAX Request for extension of the european patent (deleted)
17Q First examination report despatched

Effective date: 20180417

GRAP Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOSNIGR1

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: GRANT OF PATENT IS INTENDED

INTG Intention to grant announced

Effective date: 20181123

GRAS Grant fee paid

Free format text: ORIGINAL CODE: EPIDOSNIGR3

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE PATENT HAS BEEN GRANTED

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR

REG Reference to a national code

Ref country code: GB

Ref legal event code: FG4D

Free format text: NOT ENGLISH

REG Reference to a national code

Ref country code: CH

Ref legal event code: EP

Ref country code: AT

Ref legal event code: REF

Ref document number: 1129875

Country of ref document: AT

Kind code of ref document: T

Effective date: 20190515

REG Reference to a national code

Ref country code: IE

Ref legal event code: FG4D

Free format text: LANGUAGE OF EP DOCUMENT: FRENCH

REG Reference to a national code

Ref country code: DE

Ref legal event code: R096

Ref document number: 602016013563

Country of ref document: DE

REG Reference to a national code

Ref country code: NL

Ref legal event code: MP

Effective date: 20190508

REG Reference to a national code

Ref country code: LT

Ref legal event code: MG4D

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: SE

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20190508

Ref country code: HR

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20190508

Ref country code: NL

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20190508

Ref country code: LT

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20190508

Ref country code: ES

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20190508

Ref country code: NO

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20190808

Ref country code: FI

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20190508

Ref country code: PT

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20190908

Ref country code: AL

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20190508

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: GR

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20190809

Ref country code: RS

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20190508

Ref country code: BG

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20190808

Ref country code: LV

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20190508

REG Reference to a national code

Ref country code: AT

Ref legal event code: MK05

Ref document number: 1129875

Country of ref document: AT

Kind code of ref document: T

Effective date: 20190508

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DK

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20190508

Ref country code: EE

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20190508

Ref country code: AT

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20190508

Ref country code: SK

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20190508

Ref country code: RO

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20190508

Ref country code: CZ

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20190508

REG Reference to a national code

Ref country code: DE

Ref legal event code: R097

Ref document number: 602016013563

Country of ref document: DE

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: IT

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20190508

Ref country code: SM

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20190508

PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: TR

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20190508

26N No opposition filed

Effective date: 20200211

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: PL

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20190508

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: SI

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20190508

REG Reference to a national code

Ref country code: DE

Ref legal event code: R119

Ref document number: 602016013563

Country of ref document: DE

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: MC

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20190508

REG Reference to a national code

Ref country code: CH

Ref legal event code: PL

GBPC Gb: european patent ceased through non-payment of renewal fee

Effective date: 20200108

REG Reference to a national code

Ref country code: BE

Ref legal event code: MM

Effective date: 20200131

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: GB

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20200108

Ref country code: LU

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20200108

Ref country code: DE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20200801

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: LI

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20200131

Ref country code: BE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20200131

Ref country code: CH

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20200131

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: IE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20200108

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: MT

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20190508

Ref country code: CY

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20190508

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: MK

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20190508

Ref country code: IS

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20190908

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: FR

Payment date: 20240115

Year of fee payment: 9